Kawasaki FD501D

Kawasaki FD501DThe Kawasaki FD501D is a 0.44 l (437 cc, 26.67 cu-in) V-twin 90° liquid-cooled 4-stroke internal combustion small gasoline motor with horisontal shaft, manufactured by Kawasaki Heavy Industries LTd., for general-purpose applications.

The FD501D has OHV (overhead valve design); cast-iron cylinder liners; float type carburetor with fixed main jet; pulse type fuel pump; full transistor ignition system with fixed timing; mechanical governor and low tone muffler. The Kawasaki FD501D uses a full pressure lubrication system with spin-on oil filter and dual element air cleaner.

The engine was equipped with solenoid shift-type electric starter and 12V-15A charging coil with a regulator.

The Kawasaki FD501D develops 16.2 PS (11.9 kW; 16.0 HP) at 3,600 rpm and 32.6 Nm (3.33 kg·m; 24.06 ft·lb) at 2,800 rpm of torque. A 67.0 mm (2.64 in) cylinder bore and 62.0 mm (2.44 in) piston stroke give the motor a total of 437 cc of displacement. Compression ratio rating is 9.0:1 or 9.3:1.

General information

Engine Specifications
Model FD501D
Type 4-stroke, OHV, V-twin 90°
Displacement 437 cm 3 (26.67 cu-in)
Max. horsepower 16.2 PS (11.9 KW; 16.0 HP) at 3,600 rpm
Max. torque (crank PTO) 32.6 Nm (3.33 kg·m; 24.06 ft·lb) at 2,800 rpm
Carburetor Float type
Cooling system Liquid-cooling
Ignition system Transistorized ignition
Lubricating system Pressure feed lubrication system
Starting system Electric starter
Charging system 12 Volt – 15A with regulator
Fuel used Unleaded gasoline (octane number 86 or higher)
Fuel consumption 245 g/HPh
Cooling system Pressurized forced circulation type

Dimensions and Weight

Kawasaki FD501D
Length, mm (in) 523 (20.6)
Width, mm (in) 411 (16.2)
Height, mm (in) 534 (21.0)
Dry weight, kg (lb) 37.2 (82.0)

Cylinder block

Cylinder block
Compression ratio: 9.3:1
Cylinder bore: 67.0 mm (2.64 in)
Piston stroke: 62.0 mm (2.44 in)
Number of piston rings (compression / oil): 2 / 1
Cylinder bore inside diameter (standard): 66.980-67.000 mm (2.637-2.638 in)
Piston outside diameter (standard): 66.950-66.965 mm (2.6358-2.6364 in)
Piston to cylinder bore clearance: 0.015 mm (0.0006 in)
Top ring groove clearance: 0.10 mm (0.004 in)
Top ring end gap: 1.00 mm (0.040 in)
Piston pin outside diameter: 15.980 mm (0.629 in)
Piston pin bore inside diameter: 16.04 mm (0.631 in)
Piston pin bearing inside diameter: 16.05 mm (0.632 in)
Crankshaft journal outside diameter: 29.92 mm (1.178 in)
Crankshaft bearing inside diameter: 31.06 mm (1.223 in)
Crankshaft journal outside diameter: 29.92 mm (1.178 in)

Cylinder head

Cylinder head
Valves: 4 (2 valves per cylinder)
Valve steam diameter (INTAKE): 4.930 mm (0.1941 in)
Valve steam diameter (EXHAUST): 4.920 mm (0.1937 in)
Valve spring free length (INTAKE): 27.30 mm (1.0748 in)
Valve spring free length (EXHAUST): 27.30 mm (1.0748 in)

Tightening torque specs

Tightening torque specs
Cylinder head 21 Nm; 2.1 kg·m; 15.5 ft·lb
Connecting rod 12 Nm; 1.2 kg·m; 9 ft·lb
Flywheel 88 Nm; 9.0 kg·m; 65 ft·lb
Crankcase cover 21 Nm; 2.1 kg·m; 15.5 ft·lb
Intake manifold 8 Nm; 8.0 kg·m; 6 ft·lb
Oil drain plug 25 Nm; 2.5 kg·m; 18.5 ft·lb
Valve clearance lock nut 8.8 Nm; 0.9 kg·m; 6.5 ft·lb

Maintenance data

Maximum speed 3500 ± 100 rpm
Idle speed 1500 ± 100 rpm
Cylinder compression 12.0 kg/cm2 (170 psi) at 500 rpm
Valve clearance
Intake valve 0.25 mm (0.010 in)
Exhaust valve 0.25 mm (0.010 in)
Oil system
Oil type 4-stroke or an equivalent (SC, SD, SE, SF, SG, or SH)
Recommended oil SAE 10W-40, 10W-30, 5W-20
Oil capacity (with filter changed) 1.3 L (1.4 US qt)
Ignition system
Spark plug NGK: BPR4ES
Spark plug gap 0.6-0.7 mm (0.024-0.028 in)
Spark plug tightening torque 17 Nm; 1.7 kg·m; 12.5 ft·lb
Fuel system
Type: Float type carburetor
Carburetor model: Mikuni BV24-18
Bore diameter: 24.0 mm (0.95 in)
Venturi diameter: 18.0 mm (0.71 in)
Main jet: #112.5
Pilot jet: #47.5
Main air jet: 1.2
Pilot air jet: 1.0
Pilot air screw: 1-3/8
Fuel pump type: Pressure/vacuum operated diaphragm pump
Fuel pressure (min): 6.12 kPa (0.9 psi)
Cooling system
Type: Pressurized forced circulation type
Coolant capacity: 2.0 liters (2.11 US.qts, 1.76 Imp. qts)
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1 Comment

  1. Hello and Hope you can help me with a question about a horizontal fd501v. I want to redesign some components to stand it with valve covers on top and run a large compressor. I can easily modify the carburetor and filling fuild components to be in the right position. If I bolt your fd501v to a verticle plate will there be any Lubrication problems ect when I run the engine standing up?

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